Degree Days - Watching, Waiting and Staying Warm

September 22, 2009

By Rich Pope, Department of Plant Pathology

A near-perfect week!  Sept.13 - 20 provided seasonally normal temperatures, bright sunshine and some light rain at week's end; all of which are favorable to Iowa's maturing crop. As of Sept. 21, the mid-range forecast is calling for night temperatures that should NOT approach killing temperatures. If this bears out, it will mean no early frost in 2009.   

Degree day accumulation map for September 20, 2009

Late-season foliar diseases, especially northern corn leaf blight of corn, flourished on susceptible hybrids, and has likely reduced yields some in spots.  Soybean aphids were still found in some fields close to senescing, and winged aphids and nymphs were eary to find in central Iowa on it's overwintering host, buckthorn.

 

 

Rich Pope is a program specialist with responsibilities with Integrated Pest Management. Pope can be contacted at ropope@iastate.edu or by calling (515) 294-5899.

Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Integrated Crop Management News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on September 22, 2009. The information contained within may not be the most current and accurate depending on when it is accessed.

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